Does this Ring outside door sensor need a base station to work?

No. It connects over Amazon Sidewalk and does not require a base station, though Amazon Sidewalk is required for use and coverage may vary.

Can this outside door sensor be used to monitor outdoor areas like gates, sheds, garages, and storage spaces?

Yes. It is designed to secure outdoor access points and can monitor gates, sheds, garages, and storage spaces.

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Ring Sensors: Outside Door Sensor - Instant notifications, on Amazon Sidewalk, no base station needed, Pro Monitoring available (sold separately)

Secure outdoor access points — Monitor gates, sheds, garages, and storage spaces.
All-weather protection — IP66-rated to withstand rain, snow, and sun on any part of your property.
No base station required — connects over Amazon Sidewalk for simple, flexible coverage throughout your home and beyond (Amazon Sidewalk required for use; coverage may vary).
Add 24/7 Pro Monitoring with a compatible Ring subscription — Emergency response for break-ins, fires, and more, with no multi-year contracts.